From the Satipatthana Sutta: The Foundations of Mindfulness

 

From the Satipatthana Sutta:
The Foundations of Mindfulness

Contemplation of the Body, Section 4. Foulness: The Bodily Parts
“Again, bhikkhus, a bhikkhu reviews this same body up from the soles of the
feet and down from the top of the hair, bounded by skin, as full of many kinds
of impurity thus: ‘In this body there are head-hairs, body-hairs, nails, teeth,
skin, flesh, sinews, bones, bone-marrow, kidneys, heart, liver,
diaphragm, spleen, lungs, large intestines, small intestines, contents of
the stomach, feces, bile, phlegm, pus, blood, sweat, fat, tears, grease,
spittle, snot, oil of the joints, and urine.’ Just as though there were a bag
with an opening at both ends full of many sorts of grain, such as hill rice, red
rice, beans, peas, millet, and white rice, and a man with good eyes were to
open it and review it thus: ‘This is hill rice, this is red rice, these are beans,
these are peas, this is millet, this is white rice’; so too, a bhikkhu reviews this
same body up from the soles of the feet and down from the top of the hair,
bounded by skin, as full of many kinds of impurity thus: ‘In this body there are
head-hairs, body-hairs, nails, teeth, skin, flesh, sinews, bones, bone-marrow,
kidneys, heart, liver, diaphragm, spleen, lungs, large intestines, small
intestines, contents of the stomach, feces, bile, phlegm, pus, blood, sweat, fat,
tears, grease, spittle, snot, oil of the joints, and urine.’
“In this way he abides contemplating the body as a body internally, or he
abides contemplating the body as a body externally, or he abides
contemplating the body as a body both internally and externally. Or else he
abides contemplating in the body its arising factors, or he abides
contemplating in the body its vanishing factors, or he abides contemplating in
the body both its arising and vanishing factors. Or else mindfulness that
‘there is a body’ is simply established in him to the extent necessary for bare
knowledge and mindfulness. And he abides independent, not clinging to
anything in the world. That too is how a bhikkhu abides contemplating the
body as a body.”